采用热机械疲劳试验、扫描电镜、透射电镜等方法研究了一种镍基单晶高温合金在600～900 ℃的同相位热机械疲劳行为.结果表明:该合金在试验中承受的平均应力表现为压应力；随着机械应变幅的增大,疲劳寿命逐渐下降,应力范围和塑性应变量逐渐增大；合金在试验中表现为高温半周循环软化、低温半周循环硬化；合金热机械疲劳的主要变形机制为a/2〈110〉{111}型位错在基体内的滑移和交滑移运动；合金的断裂方式为微孔聚集型断裂,拉应力对合金的断裂起到了主导作用.
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